Malicious PDF — malware analysis report

Static analysis result for SHA-256 5408698b2779c681…

MALICIOUS

PDF

36.8 KB Created: 2020-10-28 13:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1ed7ef2298e36c094cf0969a30fedac8 SHA-1: 227e0b84252d2d6523da9d0473a481ec53402484 SHA-256: 5408698b2779c6815ca42a428b2044effc092343000e38351f9d8a56d9b2f3eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a known malicious domain, disguised with text suggesting test answers. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=digital+literacy+certificate+test+answers In PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/b3f46712be6.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/bf9eeef870.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/de0b03658.pdfIn PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/tusenux-nerit-nebibedos.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/c3ab2a8.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/2934732.pdfIn PDF document text
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/14024d15d76967.pdfIn PDF document text
    • https://kufesolujuxubi.weebly.com/uploads/1/3/4/3/134373324/lulikibinuj.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/nasunilo.pdfIn PDF document text
    • https://butiziro.weebly.com/uploads/1/3/4/3/134308177/pojunime_ximoru_nuzelidopixufi.pdfIn PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/4555137.pdfIn PDF document text
    • https://renefifukidib.weebly.com/uploads/1/3/4/3/134343870/8048018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8194/0135/files/samsung_experience_launcher_apk_for_all_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/list_of_autobiographies_of_famous_personalities.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/4493/8143/files/rodilazipevafifuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3916/5082/files/happy_birthday_hello_kitty_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8971/3083/files/hansel_and_gretel_original_story.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/3500/2533/files/tuwuvunijogexogo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7888/4759/files/woreruzogi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/based_on_the_pure_expectations_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/paxufuxomodarun.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5005 5240 bytes
SHA-256: 4257d6386e465b7521a835d9999b145bb59c732ff3377a68af91d34f8e2ed9e6
font_01_sfnt_off0000620a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x620A 10464 bytes
SHA-256: 3ad4ff1fed713793a33a08c2f991663be02f4b896eb927c20401c3a74e819ab4

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